Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Handle firewalling |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
Bart De Schuymer | 8237908 | 2010-04-13 11:40:41 +0200 | [diff] [blame] | 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * Bart De Schuymer <bdschuym@pandora.be> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * Lennert dedicates this file to Kerstin Wurdinger. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/ip.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 23 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/if_ether.h> |
| 25 | #include <linux/if_vlan.h> |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 26 | #include <linux/if_pppox.h> |
| 27 | #include <linux/ppp_defs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/netfilter_bridge.h> |
| 29 | #include <linux/netfilter_ipv4.h> |
| 30 | #include <linux/netfilter_ipv6.h> |
| 31 | #include <linux/netfilter_arp.h> |
| 32 | #include <linux/in_route.h> |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 33 | #include <linux/inetdevice.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/ip.h> |
| 36 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 37 | #include <net/route.h> |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include "br_private.h" |
| 41 | #ifdef CONFIG_SYSCTL |
| 42 | #include <linux/sysctl.h> |
| 43 | #endif |
| 44 | |
| 45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ |
| 46 | (skb->nf_bridge->data))->daddr.ipv4) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
| 48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #ifdef CONFIG_SYSCTL |
| 51 | static struct ctl_table_header *brnf_sysctl_header; |
Brian Haley | 9c1ea14 | 2006-09-18 00:03:41 -0700 | [diff] [blame] | 52 | static int brnf_call_iptables __read_mostly = 1; |
| 53 | static int brnf_call_ip6tables __read_mostly = 1; |
| 54 | static int brnf_call_arptables __read_mostly = 1; |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
| 56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #else |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 58 | #define brnf_filter_vlan_tagged 0 |
| 59 | #define brnf_filter_pppoe_tagged 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #endif |
| 61 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 62 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 63 | { |
| 64 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; |
| 65 | } |
| 66 | |
| 67 | #define IS_VLAN_IP(skb) \ |
| 68 | (skb->protocol == htons(ETH_P_8021Q) && \ |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 69 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 70 | brnf_filter_vlan_tagged) |
| 71 | |
| 72 | #define IS_VLAN_IPV6(skb) \ |
| 73 | (skb->protocol == htons(ETH_P_8021Q) && \ |
| 74 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ |
| 75 | brnf_filter_vlan_tagged) |
| 76 | |
| 77 | #define IS_VLAN_ARP(skb) \ |
| 78 | (skb->protocol == htons(ETH_P_8021Q) && \ |
| 79 | vlan_proto(skb) == htons(ETH_P_ARP) && \ |
| 80 | brnf_filter_vlan_tagged) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 82 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
| 83 | { |
| 84 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + |
| 85 | sizeof(struct pppoe_hdr))); |
| 86 | } |
| 87 | |
| 88 | #define IS_PPPOE_IP(skb) \ |
| 89 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 90 | pppoe_proto(skb) == htons(PPP_IP) && \ |
| 91 | brnf_filter_pppoe_tagged) |
| 92 | |
| 93 | #define IS_PPPOE_IPV6(skb) \ |
| 94 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 95 | pppoe_proto(skb) == htons(PPP_IPV6) && \ |
| 96 | brnf_filter_pppoe_tagged) |
| 97 | |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 98 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 99 | { |
| 100 | } |
| 101 | |
| 102 | static struct dst_ops fake_dst_ops = { |
| 103 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 104 | .protocol = cpu_to_be16(ETH_P_IP), |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 105 | .update_pmtu = fake_update_pmtu, |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 106 | .entries = ATOMIC_INIT(0), |
| 107 | }; |
| 108 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 109 | /* |
| 110 | * Initialize bogus route table used to keep netfilter happy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | * Currently, we fill in the PMTU entry because netfilter |
| 112 | * refragmentation needs it, and the rt_flags entry because |
| 113 | * ipt_REJECT needs it. Future netfilter modules might |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 114 | * require us to fill additional fields. |
| 115 | */ |
| 116 | void br_netfilter_rtable_init(struct net_bridge *br) |
| 117 | { |
| 118 | struct rtable *rt = &br->fake_rtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 120 | atomic_set(&rt->u.dst.__refcnt, 1); |
Rami Rosen | ad61980 | 2008-08-05 01:21:22 -0700 | [diff] [blame] | 121 | rt->u.dst.dev = br->dev; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 122 | rt->u.dst.path = &rt->u.dst; |
| 123 | rt->u.dst.metrics[RTAX_MTU - 1] = 1500; |
| 124 | rt->u.dst.flags = DST_NOXFRM; |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 125 | rt->u.dst.ops = &fake_dst_ops; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
| 129 | { |
| 130 | struct net_bridge_port *port = rcu_dereference(dev->br_port); |
| 131 | |
| 132 | return port ? &port->br->fake_rtable : NULL; |
| 133 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 135 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
| 136 | { |
| 137 | struct net_bridge_port *port = rcu_dereference(dev->br_port); |
| 138 | |
| 139 | return port ? port->br->dev : NULL; |
| 140 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 142 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
| 143 | { |
| 144 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); |
| 145 | if (likely(skb->nf_bridge)) |
| 146 | atomic_set(&(skb->nf_bridge->use), 1); |
| 147 | |
| 148 | return skb->nf_bridge; |
| 149 | } |
| 150 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 151 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
| 152 | { |
| 153 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 154 | |
| 155 | if (atomic_read(&nf_bridge->use) > 1) { |
| 156 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); |
| 157 | |
| 158 | if (tmp) { |
| 159 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); |
| 160 | atomic_set(&tmp->use, 1); |
| 161 | nf_bridge_put(nf_bridge); |
| 162 | } |
| 163 | nf_bridge = tmp; |
| 164 | } |
| 165 | return nf_bridge; |
| 166 | } |
| 167 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 168 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 169 | { |
| 170 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 171 | |
| 172 | skb_push(skb, len); |
| 173 | skb->network_header -= len; |
| 174 | } |
| 175 | |
| 176 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 177 | { |
| 178 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 179 | |
| 180 | skb_pull(skb, len); |
| 181 | skb->network_header += len; |
| 182 | } |
| 183 | |
| 184 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 185 | { |
| 186 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 187 | |
| 188 | skb_pull_rcsum(skb, len); |
| 189 | skb->network_header += len; |
| 190 | } |
| 191 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 192 | static inline void nf_bridge_save_header(struct sk_buff *skb) |
| 193 | { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 194 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 195 | |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 196 | skb_copy_from_linear_data_offset(skb, -header_size, |
| 197 | skb->nf_bridge->data, header_size); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 198 | } |
| 199 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 200 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
| 201 | { |
| 202 | if (skb->nf_bridge->mask & BRNF_8021Q) |
| 203 | skb->protocol = htons(ETH_P_8021Q); |
| 204 | else if (skb->nf_bridge->mask & BRNF_PPPoE) |
| 205 | skb->protocol = htons(ETH_P_PPP_SES); |
| 206 | } |
| 207 | |
| 208 | /* Fill in the header for fragmented IP packets handled by |
| 209 | * the IPv4 connection tracking code. |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 210 | */ |
| 211 | int nf_bridge_copy_header(struct sk_buff *skb) |
| 212 | { |
| 213 | int err; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 214 | unsigned int header_size; |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 215 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 216 | nf_bridge_update_protocol(skb); |
| 217 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 218 | err = skb_cow_head(skb, header_size); |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 219 | if (err) |
| 220 | return err; |
| 221 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 222 | skb_copy_to_linear_data_offset(skb, -header_size, |
| 223 | skb->nf_bridge->data, header_size); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 224 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 225 | return 0; |
| 226 | } |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
| 229 | /* Undo the changes made for ip6tables PREROUTING and continue the |
| 230 | * bridge PRE_ROUTING hook. */ |
| 231 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) |
| 232 | { |
| 233 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 234 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 237 | skb->pkt_type = PACKET_OTHERHOST; |
| 238 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 239 | } |
| 240 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
| 241 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 242 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 243 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 244 | kfree_skb(skb); |
| 245 | return 0; |
| 246 | } |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 247 | dst_hold(&rt->u.dst); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 248 | skb_dst_set(skb, &rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 251 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 252 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 253 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | br_handle_frame_finish, 1); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 259 | /* Obtain the correct destination MAC address, while preserving the original |
| 260 | * source MAC address. If we already know this address, we just copy it. If we |
| 261 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 262 | * sure that br_handle_frame_finish() is called afterwards. |
| 263 | */ |
| 264 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
| 265 | { |
| 266 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 267 | struct dst_entry *dst; |
| 268 | |
| 269 | skb->dev = bridge_parent(skb->dev); |
| 270 | if (!skb->dev) |
| 271 | goto free_skb; |
| 272 | dst = skb_dst(skb); |
| 273 | if (dst->hh) { |
| 274 | neigh_hh_bridge(dst->hh, skb); |
| 275 | skb->dev = nf_bridge->physindev; |
| 276 | return br_handle_frame_finish(skb); |
| 277 | } else if (dst->neighbour) { |
| 278 | /* the neighbour function below overwrites the complete |
| 279 | * MAC header, so we save the Ethernet source address and |
| 280 | * protocol number. */ |
| 281 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); |
| 282 | /* tell br_dev_xmit to continue with forwarding */ |
| 283 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
| 284 | return dst->neighbour->output(skb); |
| 285 | } |
| 286 | free_skb: |
| 287 | kfree_skb(skb); |
| 288 | return 0; |
| 289 | } |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | /* This requires some explaining. If DNAT has taken place, |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 292 | * we will need to fix up the destination Ethernet address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | * |
| 294 | * There are two cases to consider: |
| 295 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 296 | * port group as it was received on. We can still bridge |
| 297 | * the packet. |
| 298 | * 2. The packet was DNAT'ed to a different device, either |
| 299 | * a non-bridged device or another bridge port group. |
| 300 | * The packet will need to be routed. |
| 301 | * |
| 302 | * The correct way of distinguishing between these two cases is to |
| 303 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 304 | * changed to the destination device if ip_route_input() succeeds. |
| 305 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 306 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 308 | * If the output device equals the logical bridge device the packet |
| 309 | * came in on, we can consider this bridging. The corresponding MAC |
| 310 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | * Otherwise, the packet is considered to be routed and we just |
| 312 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 313 | * later be passed up to the IP stack to be routed. For a redirected |
| 314 | * packet, ip_route_input() will give back the localhost as output device, |
| 315 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 317 | * Let's now consider the case that ip_route_input() fails: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | * |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 319 | * This can be because the destination address is martian, in which case |
| 320 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 321 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 322 | * ip_route_output_key() can return success. The source |
| 323 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | * thinks we're handling a locally generated packet and won't care |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 325 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 326 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 327 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 328 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
| 330 | { |
| 331 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 332 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 334 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 335 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 338 | skb->pkt_type = PACKET_OTHERHOST; |
| 339 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 340 | } |
| 341 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (dnat_took_place(skb)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 343 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 344 | struct flowi fl = { |
| 345 | .nl_u = { |
| 346 | .ip4_u = { |
| 347 | .daddr = iph->daddr, |
| 348 | .saddr = 0, |
| 349 | .tos = RT_TOS(iph->tos) }, |
| 350 | }, |
| 351 | .proto = 0, |
| 352 | }; |
Eric Dumazet | f3abc9b | 2009-08-24 19:35:38 +0200 | [diff] [blame] | 353 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 354 | |
| 355 | /* If err equals -EHOSTUNREACH the error is due to a |
| 356 | * martian destination or due to the fact that |
| 357 | * forwarding is disabled. For most martian packets, |
| 358 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 359 | * martian destinations: loopback destinations and destination |
| 360 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 361 | * destination is the loopback device and not the bridge. */ |
| 362 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 363 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
Alexey Dobriyan | 249b620 | 2008-11-04 14:31:29 +0100 | [diff] [blame] | 365 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 366 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 367 | * require ip_forwarding. */ |
| 368 | if (((struct dst_entry *)rt)->dev == dev) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 369 | skb_dst_set(skb, (struct dst_entry *)rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | goto bridged_dnat; |
| 371 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | dst_release((struct dst_entry *)rt); |
| 373 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 374 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | kfree_skb(skb); |
| 376 | return 0; |
| 377 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 378 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 381 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 382 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 383 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 384 | NF_BR_PRE_ROUTING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | skb, skb->dev, NULL, |
| 386 | br_nf_pre_routing_finish_bridge, |
| 387 | 1); |
| 388 | return 0; |
| 389 | } |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 390 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | skb->pkt_type = PACKET_HOST; |
| 392 | } |
| 393 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 394 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 395 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 396 | kfree_skb(skb); |
| 397 | return 0; |
| 398 | } |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 399 | dst_hold(&rt->u.dst); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 400 | skb_dst_set(skb, &rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 404 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 405 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 406 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | br_handle_frame_finish, 1); |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 413 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | { |
| 415 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 416 | |
| 417 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 418 | skb->pkt_type = PACKET_HOST; |
| 419 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 420 | } |
| 421 | |
| 422 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 423 | nf_bridge->physindev = skb->dev; |
| 424 | skb->dev = bridge_parent(skb->dev); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 425 | if (skb->protocol == htons(ETH_P_8021Q)) |
| 426 | nf_bridge->mask |= BRNF_8021Q; |
| 427 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
| 428 | nf_bridge->mask |= BRNF_PPPoE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 429 | |
| 430 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ |
| 434 | static int check_hbh_len(struct sk_buff *skb) |
| 435 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 436 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | u32 pkt_len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 438 | const unsigned char *nh = skb_network_header(skb); |
| 439 | int off = raw - nh; |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 440 | int len = (raw[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
| 442 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 443 | goto bad; |
| 444 | |
| 445 | off += 2; |
| 446 | len -= 2; |
| 447 | |
| 448 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 449 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 451 | switch (nh[off]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | case IPV6_TLV_PAD0: |
| 453 | optlen = 1; |
| 454 | break; |
| 455 | |
| 456 | case IPV6_TLV_PADN: |
| 457 | break; |
| 458 | |
| 459 | case IPV6_TLV_JUMBO: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 460 | if (nh[off + 1] != 4 || (off & 3) != 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 462 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 463 | if (pkt_len <= IPV6_MAXPLEN || |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 464 | ipv6_hdr(skb)->payload_len) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 465 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 467 | goto bad; |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 468 | if (pskb_trim_rcsum(skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 469 | pkt_len + sizeof(struct ipv6hdr))) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 470 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 471 | nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | break; |
| 473 | default: |
| 474 | if (optlen > len) |
| 475 | goto bad; |
| 476 | break; |
| 477 | } |
| 478 | off += optlen; |
| 479 | len -= optlen; |
| 480 | } |
| 481 | if (len == 0) |
| 482 | return 0; |
| 483 | bad: |
| 484 | return -1; |
| 485 | |
| 486 | } |
| 487 | |
| 488 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
| 489 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ |
| 490 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 491 | struct sk_buff *skb, |
| 492 | const struct net_device *in, |
| 493 | const struct net_device *out, |
| 494 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | { |
| 496 | struct ipv6hdr *hdr; |
| 497 | u32 pkt_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | if (skb->len < sizeof(struct ipv6hdr)) |
| 500 | goto inhdr_error; |
| 501 | |
| 502 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 503 | goto inhdr_error; |
| 504 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 505 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | if (hdr->version != 6) |
| 508 | goto inhdr_error; |
| 509 | |
| 510 | pkt_len = ntohs(hdr->payload_len); |
| 511 | |
| 512 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 513 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) |
| 514 | goto inhdr_error; |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 515 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
| 516 | goto inhdr_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | } |
| 518 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 519 | goto inhdr_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 521 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 522 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 524 | if (!setup_pre_routing(skb)) |
| 525 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 527 | skb->protocol = htons(ETH_P_IPV6); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 528 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | br_nf_pre_routing_finish_ipv6); |
| 530 | |
| 531 | return NF_STOLEN; |
| 532 | |
| 533 | inhdr_error: |
| 534 | return NF_DROP; |
| 535 | } |
| 536 | |
| 537 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 538 | * Replicate the checks that IPv4 does on packet reception. |
| 539 | * Set skb->dev to the bridge device (i.e. parent of the |
| 540 | * receiving device) to make netfilter happy, the REDIRECT |
| 541 | * target in particular. Save the original destination IP |
| 542 | * address to be able to detect DNAT afterwards. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 543 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | ee02b3a | 2006-01-06 13:13:29 -0800 | [diff] [blame] | 544 | const struct net_device *in, |
| 545 | const struct net_device *out, |
| 546 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | { |
| 548 | struct iphdr *iph; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 549 | __u32 len = nf_bridge_encap_header_len(skb); |
| 550 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 551 | if (unlikely(!pskb_may_pull(skb, len))) |
| 552 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 554 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
| 555 | IS_PPPOE_IPV6(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | #ifdef CONFIG_SYSCTL |
| 557 | if (!brnf_call_ip6tables) |
| 558 | return NF_ACCEPT; |
| 559 | #endif |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 560 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
| 562 | } |
| 563 | #ifdef CONFIG_SYSCTL |
| 564 | if (!brnf_call_iptables) |
| 565 | return NF_ACCEPT; |
| 566 | #endif |
| 567 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 568 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
| 569 | !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | return NF_ACCEPT; |
| 571 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 572 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 575 | goto inhdr_error; |
| 576 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 577 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | if (iph->ihl < 5 || iph->version != 4) |
| 579 | goto inhdr_error; |
| 580 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 581 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | goto inhdr_error; |
| 583 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 584 | iph = ip_hdr(skb); |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 585 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | goto inhdr_error; |
| 587 | |
| 588 | len = ntohs(iph->tot_len); |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 589 | if (skb->len < len || len < 4 * iph->ihl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | goto inhdr_error; |
| 591 | |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 592 | pskb_trim_rcsum(skb, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 594 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 595 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 597 | if (!setup_pre_routing(skb)) |
| 598 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | store_orig_dstaddr(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 600 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 602 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | br_nf_pre_routing_finish); |
| 604 | |
| 605 | return NF_STOLEN; |
| 606 | |
| 607 | inhdr_error: |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 608 | // IP_INC_STATS_BH(IpInHdrErrors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | out: |
| 610 | return NF_DROP; |
| 611 | } |
| 612 | |
| 613 | |
| 614 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 615 | /* The packet is locally destined, which requires a real |
| 616 | * dst_entry, so detach the fake one. On the way up, the |
| 617 | * packet would pass through PRE_ROUTING again (which already |
| 618 | * took place when the packet entered the bridge), but we |
| 619 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 620 | * prevent this from happening. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 621 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 622 | const struct net_device *in, |
| 623 | const struct net_device *out, |
| 624 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 626 | struct rtable *rt = skb_rtable(skb); |
| 627 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 628 | if (rt && rt == bridge_parent_rtable(in)) |
| 629 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | return NF_ACCEPT; |
| 632 | } |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /* PF_BRIDGE/FORWARD *************************************************/ |
| 635 | static int br_nf_forward_finish(struct sk_buff *skb) |
| 636 | { |
| 637 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 638 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 640 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | in = nf_bridge->physindev; |
| 642 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 643 | skb->pkt_type = PACKET_OTHERHOST; |
| 644 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 645 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame^] | 646 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } else { |
| 648 | in = *((struct net_device **)(skb->cb)); |
| 649 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 650 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 651 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 652 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 653 | skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 658 | * netfilter with indev and outdev set to the bridge device, |
| 659 | * but we are still able to filter on the 'real' indev/outdev |
| 660 | * because of the physdev module. For ARP, indev and outdev are the |
| 661 | * bridge ports. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 662 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 663 | const struct net_device *in, |
| 664 | const struct net_device *out, |
| 665 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 668 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 669 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
| 671 | if (!skb->nf_bridge) |
| 672 | return NF_ACCEPT; |
| 673 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 674 | /* Need exclusive nf_bridge_info since we might have multiple |
| 675 | * different physoutdevs. */ |
| 676 | if (!nf_bridge_unshare(skb)) |
| 677 | return NF_DROP; |
| 678 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 679 | parent = bridge_parent(out); |
| 680 | if (!parent) |
| 681 | return NF_DROP; |
| 682 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 683 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
| 684 | IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | pf = PF_INET; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 686 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
| 687 | IS_PPPOE_IPV6(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | pf = PF_INET6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 689 | else |
| 690 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 692 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | nf_bridge = skb->nf_bridge; |
| 695 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 696 | skb->pkt_type = PACKET_HOST; |
| 697 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 698 | } |
| 699 | |
| 700 | /* The physdev module checks on this */ |
| 701 | nf_bridge->mask |= BRNF_BRIDGED; |
| 702 | nf_bridge->physoutdev = skb->dev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 703 | if (pf == PF_INET) |
| 704 | skb->protocol = htons(ETH_P_IP); |
| 705 | else |
| 706 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 708 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 709 | br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | return NF_STOLEN; |
| 712 | } |
| 713 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 714 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 715 | const struct net_device *in, |
| 716 | const struct net_device *out, |
| 717 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | struct net_device **d = (struct net_device **)(skb->cb); |
| 720 | |
| 721 | #ifdef CONFIG_SYSCTL |
| 722 | if (!brnf_call_arptables) |
| 723 | return NF_ACCEPT; |
| 724 | #endif |
| 725 | |
Stephen Hemminger | f8a2602 | 2006-03-20 22:57:46 -0800 | [diff] [blame] | 726 | if (skb->protocol != htons(ETH_P_ARP)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 727 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 729 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 732 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 733 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 734 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | return NF_ACCEPT; |
| 736 | } |
| 737 | *d = (struct net_device *)in; |
Jan Engelhardt | fdc9314 | 2008-10-20 03:34:51 -0700 | [diff] [blame] | 738 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | (struct net_device *)out, br_nf_forward_finish); |
| 740 | |
| 741 | return NF_STOLEN; |
| 742 | } |
| 743 | |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 744 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 745 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 746 | { |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 747 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
Bart De Schuymer | 6c79bf0 | 2010-04-20 16:22:01 +0200 | [diff] [blame] | 748 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
Herbert Xu | 89114af | 2006-07-08 13:34:32 -0700 | [diff] [blame] | 749 | !skb_is_gso(skb)) |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 750 | return ip_fragment(skb, br_dev_queue_push_xmit); |
| 751 | else |
| 752 | return br_dev_queue_push_xmit(skb); |
| 753 | } |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 754 | #else |
| 755 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 756 | { |
| 757 | return br_dev_queue_push_xmit(skb); |
| 758 | } |
| 759 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 762 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 763 | const struct net_device *in, |
| 764 | const struct net_device *out, |
| 765 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 767 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 769 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 771 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 772 | return NF_ACCEPT; |
| 773 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 774 | if (!realoutdev) |
| 775 | return NF_DROP; |
| 776 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 777 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
| 778 | IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | pf = PF_INET; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 780 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
| 781 | IS_PPPOE_IPV6(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | pf = PF_INET6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 783 | else |
| 784 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 787 | * about the value of skb->pkt_type. */ |
| 788 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 789 | skb->pkt_type = PACKET_HOST; |
| 790 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 791 | } |
| 792 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 793 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | nf_bridge_save_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 795 | if (pf == PF_INET) |
| 796 | skb->protocol = htons(ETH_P_IP); |
| 797 | else |
| 798 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 800 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 801 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
| 803 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
| 805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | /* IP/SABOTAGE *****************************************************/ |
| 807 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 808 | * for the second time. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 809 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 810 | const struct net_device *in, |
| 811 | const struct net_device *out, |
| 812 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 814 | if (skb->nf_bridge && |
| 815 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | return NF_STOP; |
| 817 | } |
| 818 | |
| 819 | return NF_ACCEPT; |
| 820 | } |
| 821 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 822 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 823 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 824 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 825 | { |
| 826 | .hook = br_nf_pre_routing, |
| 827 | .owner = THIS_MODULE, |
| 828 | .pf = PF_BRIDGE, |
| 829 | .hooknum = NF_BR_PRE_ROUTING, |
| 830 | .priority = NF_BR_PRI_BRNF, |
| 831 | }, |
| 832 | { |
| 833 | .hook = br_nf_local_in, |
| 834 | .owner = THIS_MODULE, |
| 835 | .pf = PF_BRIDGE, |
| 836 | .hooknum = NF_BR_LOCAL_IN, |
| 837 | .priority = NF_BR_PRI_BRNF, |
| 838 | }, |
| 839 | { |
| 840 | .hook = br_nf_forward_ip, |
| 841 | .owner = THIS_MODULE, |
| 842 | .pf = PF_BRIDGE, |
| 843 | .hooknum = NF_BR_FORWARD, |
| 844 | .priority = NF_BR_PRI_BRNF - 1, |
| 845 | }, |
| 846 | { |
| 847 | .hook = br_nf_forward_arp, |
| 848 | .owner = THIS_MODULE, |
| 849 | .pf = PF_BRIDGE, |
| 850 | .hooknum = NF_BR_FORWARD, |
| 851 | .priority = NF_BR_PRI_BRNF, |
| 852 | }, |
| 853 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 854 | .hook = br_nf_post_routing, |
| 855 | .owner = THIS_MODULE, |
| 856 | .pf = PF_BRIDGE, |
| 857 | .hooknum = NF_BR_POST_ROUTING, |
| 858 | .priority = NF_BR_PRI_LAST, |
| 859 | }, |
| 860 | { |
| 861 | .hook = ip_sabotage_in, |
| 862 | .owner = THIS_MODULE, |
| 863 | .pf = PF_INET, |
| 864 | .hooknum = NF_INET_PRE_ROUTING, |
| 865 | .priority = NF_IP_PRI_FIRST, |
| 866 | }, |
| 867 | { |
| 868 | .hook = ip_sabotage_in, |
| 869 | .owner = THIS_MODULE, |
| 870 | .pf = PF_INET6, |
| 871 | .hooknum = NF_INET_PRE_ROUTING, |
| 872 | .priority = NF_IP6_PRI_FIRST, |
| 873 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | }; |
| 875 | |
| 876 | #ifdef CONFIG_SYSCTL |
| 877 | static |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 878 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 879 | void __user * buffer, size_t * lenp, loff_t * ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | { |
| 881 | int ret; |
| 882 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 883 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
| 885 | if (write && *(int *)(ctl->data)) |
| 886 | *(int *)(ctl->data) = 1; |
| 887 | return ret; |
| 888 | } |
| 889 | |
| 890 | static ctl_table brnf_table[] = { |
| 891 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | .procname = "bridge-nf-call-arptables", |
| 893 | .data = &brnf_call_arptables, |
| 894 | .maxlen = sizeof(int), |
| 895 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 896 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | }, |
| 898 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | .procname = "bridge-nf-call-iptables", |
| 900 | .data = &brnf_call_iptables, |
| 901 | .maxlen = sizeof(int), |
| 902 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 903 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | }, |
| 905 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | .procname = "bridge-nf-call-ip6tables", |
| 907 | .data = &brnf_call_ip6tables, |
| 908 | .maxlen = sizeof(int), |
| 909 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 910 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | }, |
| 912 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | .procname = "bridge-nf-filter-vlan-tagged", |
| 914 | .data = &brnf_filter_vlan_tagged, |
| 915 | .maxlen = sizeof(int), |
| 916 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 917 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 919 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 920 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 921 | .data = &brnf_filter_pppoe_tagged, |
| 922 | .maxlen = sizeof(int), |
| 923 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 924 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 925 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 926 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | }; |
| 928 | |
Pavel Emelyanov | b5ccd79 | 2008-01-09 00:30:05 -0800 | [diff] [blame] | 929 | static struct ctl_path brnf_path[] = { |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 930 | { .procname = "net", }, |
| 931 | { .procname = "bridge", }, |
Pavel Emelyanov | b5ccd79 | 2008-01-09 00:30:05 -0800 | [diff] [blame] | 932 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | }; |
| 934 | #endif |
| 935 | |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 936 | int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 938 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 940 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 941 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | #ifdef CONFIG_SYSCTL |
Pavel Emelyanov | b5ccd79 | 2008-01-09 00:30:05 -0800 | [diff] [blame] | 944 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 946 | printk(KERN_WARNING |
| 947 | "br_netfilter: can't register to sysctl.\n"); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 948 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 949 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | return 0; |
| 954 | } |
| 955 | |
| 956 | void br_netfilter_fini(void) |
| 957 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 958 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | #ifdef CONFIG_SYSCTL |
| 960 | unregister_sysctl_table(brnf_sysctl_header); |
| 961 | #endif |
| 962 | } |